"In 2003, PLoS launched a nonprofit scientific and medical publishing venture that provides scientists and physicians with high-quality, high-profile journals in which to publish their most important work. Under the open access model, PLoS journals are immediately available online, with no charges for access and no restrictions on subsequent redistribution or use, as long as the author(s) and source are cited, as specified by the Creative Commons Attribution License."

NNDB has added thousands of bibliographies for people, organizations, schools, and general topics, listing
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books that might be critical omissions.